I checked all my reference stuff and I have nothing from Martin that far back so I have to go by memory. If memory is correct, which is always a risk to assume these days, the Lynx Magnum was available 45-60 or 55-70#. I do not remember them ever offering it with an 80# maximum option. String length I believe was 37" on both. Guys these days probably feel the draw weight is more since the let-off is 50-60% and they are not used to that. Big "R" would not be my establishment of choice if trying to figure out specs on an older bow. Might need to get to a long standing pro-shop for that. If you absolutely need accurate specs I can always call Terry Martin. He would know for sure, but I expect he might be a little hard to reach right now with all the things that are going on over there in Walla Walla.
Sorry I was unable to be more definite and specific. Good Luck!